pci: enable vfio device binding
pci: enable vfio device binding

Add support for binding VFIO devices if RTE_PCI_DRV_NEED_MAPPING is set
for this driver. Try VFIO first, if not mapped then try IGB_UIO too.

Signed-off-by: Anatoly Burakov <814e00d8f6e4e81b7ccc7e3e5a0bfec0078f0203@intel.com>
Tested-by: HuilongX Xu <66b391ba07b4e1e575c4888dad46879fa332fb22@intel.com>
Tested-by: Waterman Cao <8e01f67a90086248c4e0cdea3a53a7cacd141398@intel.com>
Acked-by: Thomas Monjalon <ee2fa8b2681c737f775687e475dcbf2028a412f1@6wind.com>

tsphillips/dpdk-fork,venkynv/dpdk-mirror,msune/dpdk,mixja/dpdk,venkynv/dpdk-mirror,tsphillips/dpdk-fork,mixja/dpdk,mixja/dpdk,msune/dpdk,john-mcnamara-intel/dpdk,tsphillips/dpdk-fork,venkynv/dpdk-mirror,venkynv/dpdk-mirror,john-mcnamara-intel/dpdk,msune/dpdk,msune/dpdk,john-mcnamara-intel/dpdk,tsphillips/dpdk-fork,john-mcnamara-intel/dpdk,mixja/dpdk